Q.Avocado Care
Is your advice about fertilising in February Northern or Southern Hemisphere related?

If you are growing an Avocado as a houseplant here is a link with care information.
https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-houseplant-care.htm
Since most Avocado that are grown outdoors, the care information in the article below would be for warm climates, zones 8-10
The information in the link below would be for an outdoor Avocado in these growing zones.
https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-tree-growing.htm
http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=1732